Valve mechanism for steam-engines.



No.` 739,449. PATENTE'D SEPT. 22, 1903.

G. SCHMID.

VALVE MBGHANISM FOR STEAMBNGINES.

. APPLIoATIox FILED un. 29, 1902.

xo'loDEL. 4 sums-SERT z.

\ i l: a i,Y lui No. 739,449. PATENTED SEPT. 22, 1903.

A c. SGHMID.' A VALVE' MBGHANISM POR STEAM ENGINES.-

APFLIOATION FILED JAN. 29, 1902. N0 MODEL. l 4 SHEETS-SHEET 3.

illllllllllll! lill i L F15/ WIJVVEE'ES- INED-ima l @rfy-- @am-M @WMM No. 739,449. V PATENTED-SEPT. 2z, 1903.

` c. SCHMID. VALVE MEGHANIS'M EOE STEAM ENGINES.

PPLIGATION FILED JAN. 29, 1902.

No MODEL. 4 sHEETssEEET 4. .V

HIIIIIUIIII HI -B i 4 l A' the piston therein, and`A2 the piston-rod.

Y UNITED 'STATI-:s

Patented September 22, 1903.

PATENT OFFICE.

CHARLES sCIIMID, OF CHICAGO, ILLINOIs, AssICNonOF Aomi-,HALFv To WILLIAMv P. CREnNI-IILL, OF CHICAGO, ILLINOIS.

vALvI-:M'ECHANIsMjFOa sTEAMfENcmEs;

SPECIFICATION forming part'of Letters Patent o. 739,449, dated September 22, 1903.l

4 Application led January 29, 190l2. Serial No. 91.670. (No model.)

To' aZZ whom zult may con/cern.: i Be it known that I, CHARLES SCHMID, a citizen of the United States of America, residing at Chicago, -in the county of Cook and State of Illinois, have invented certain new and usefullmprovements in Valve Mechanism for Steam-Engines, of which the following is a description.

My invention is in the nature of an improvement upon the invention shown and cle- 'scribed in Letters Patent issued to me on Decernber 10, 1895, No. 551,049.

letters indicatelike 'or corresponding parts, -Figure l is a sectional View of the steam-chest and valve of a steam-engine, showing a part of the steam-cyl-inderthereof. Fig. 2 is a similar section showing the parts in a slightly different position. Fig. 3 ,is a similar view showing the parts in still another position.

Figs. 4, 5, and 6 show sections of the steamchest provided with a slightly-modified form of steam-valve, also shown in section, the sev- Yeral views showing different positions of the valve. Fig. 7 is a cross-section of Fig. 5. Fig. 8 represents an indicator-card taken from an engine, showingA the improved operation of 4said engine'when equipped with my improvement; 'and Fig. 9 isa top plan of the supplemental valve shown in Figs. 4, 5, and 7.

In the drawings, A representsthe cylinder,

ed to provide an independent movement thereof for purposes hereinafter stated. The valve E is provided with inclined inner walls -e so formed that the impinging steam from 'the Cylinder willserve to shift or operate said `valve independently of the main valve C. et

and described in said -patand aare the usual s teamways 'from the steam-chest into the cylinder, and a2 is the exhaust-port. f

In the form shown in Figs. l, 2, and 3 the valve C is constructed in the form of a pistonand is known as a piston-valve. The valve Eis in the form of a spool supported by the valve C and maintained in position by the inclosingwalls of the steam-Chest. As

shown, it is of a length less than the distance between the end walls of valve C for the purposes stated.

Upon the inner face of each end of the valve C is preferably formed a recess or chamber e', and the end of the valve E is correspondinglyoonstructed to cooperate with said recess or Chamber as the valve is moved backward andlforward. The object of this construction is the cushioning of the contact of theparts, thus preventing the shock or noise. 'In order to assemble the parts, it is necessary vthat the valve C be formed in sections in order that the spool-valve E'may be placed thereon. Forvthis'purpose I prefer to construct the' parts with a screw-threaded conneCtiOn, as shownat c.

- The operation of my improvement as thus I clined face e of the valveE, and forces the valve to the right, permitting the instant opening of the port to the extent permitted by the movement of the valve E for the escape of the steam.V (See Fig. 2:) ',Ihe `continued movement of the valve E with the main-valve Cserves to open the passage ct sufficiently to allow the full and complete escape-Of the steam over .the bridge-wall and through the exhaust-port a2. In this operation the steamway o. is opened in the usual manner and the steamris admitted to the opposite end of the cylinder. As shown in` Fig. 3, the valve is moving in the opposite direction and the parts are in a position when the exhaust-'steam Ioo is admitted to the port a2 through the way a and the live steam is admitted to the steamway a and conducted to the opposite end of the piston A.

As shown in Figs. et, 5, (i, and 7, the main valve is not constructed in the piston form, as shown in the preceding figures. The said valve is secured to the valve-stem D by the yoke D, and the auxiliary valve E is positioned within the main valve substantially as shown in the preceding figures. The only difference results from the different form of the main valve. The operation is substantially the same as before described, the position of the various parts in the operation of the device being clearly shown in Figs. 4, 5, and (5. As an independent improvement I prefer when my invention is embodied in the form shown in Figs. et, 5, 6, and 7 to construct an auxiliary steamway G through F, extending from the live-steam chamber on one side of the valve to the live-steam chamber opposite. The object is to primarily conduct live steam from the opposite end of the steam-chest to give the piston its first impulse before the valve regularly opens the port for the purpose. This construction, in connection with the quick release of steam aorded by means of the operation of the auxiliary valve E, as clearly shown in Figs. 4, 5, and l5, forms an importantimprovement in the quick action of the engine and in the economy of steam. As set forth in my previous patent, the use of the supplemental valve E increases the inside lap of the steamvalve without interfering with the quick release of the steam, while the auxiliary steamway G admits a portion of the steam to the steamway on the opposite side of the piston before the valve has reached the point to admit the steam in the usual manner.

In the construction shown in my previous patent referred to the steam passes between the supplemental valve and the lower wall of the cavity-plate, thereby shifting the supplemental valve. In practice it has been found that it is not necessary that the steam shall pass between said valve and an opposed fixed portion of the main valve, as the action of the steam upon the inclined face of the supplemental valve is sufficient for said purpose. By the inclined face I wish to be understood as meaning a face so formed that the impinging steam will serve to shift the supplemental valve. As shown in the drawings, the inner faces of the supplemental valve are formed more in accordance with a curved line, and this serves the purpose sought. By the term inclined face in the claims, therefore,I wish to be understood as meaning a face so formed that the contact of the impinging steam will shift said valve, as set forth.

Having thus described my invention, it is obvious that various immaterial modifications may be made without departing` from the spirit of my invention. Therefore I do not wish to be understood as limiting myself to the exact form and construction shown.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In valve mechanism a piston steam-valve formed in a plurality of parts, and constructed to be connected to complete the valve, in combination with a spool-shaped supplemental valve located between the ends of the piston and longitudinally movable therein substantially as described.

2. In valve mechanism, the combination with a piston main valve having the inner surfaces of its ends recessed or chambered, of a spool-shaped supplemental valve located between the ends of the piston-valve and longitudinally movable between the same, and having its ends correspondingly formed to cushion the movement of the supplemental valve substantially as described.

3. In valve mechanism, the combination with apiston main valve C,formed in twoparts and adapted to be connected to complete the whole, the inner surface of the ends of said valve being chambered, in combination with the supplemental valve E, arranged between the ends of the piston-valve C, and longitudinally movable between the same, and having its ends formed to correspond with the chambers e', substantially as described.

4. Valve mechanism comprising` a main piston-valve having the inner surfaces of its ends recessed or chambered to form pockets, of a supplemental spool-shaped valve located between the ends of the main valve and longitudinally movable therebetween, the outer surfaces of the ends of the supplemental valve being formed to enter the pockets of the main valve whereby the movements of said supplemental valve are cushioned; substantially as described.

5. Valve mechanism comprising a main valve having the inner surfaces of its ends recessed or chambered to form pockets, of a supplemental valve located between the ends of the main valve and longitudinally movable therebetween, the outer surfaces of the ends of the supplemental valve bein g formed to enter the pockets of the main valve whereby the movements of said supplemental valve are cushioned; substantially as described.

6. Valve mechanism comprising a pistonvalve, and a spool-shaped supplemental valve shiftable between the ends of the piston-valve, the outside lap of the piston-valve being of sufficient length to permit the spool-shaped valve and the space between the same and the piston-valve to pass the inlet-ports before live steam is admitted thereto; substantially as and for the purpose described.

7. Valve mechanism comprising a main valve having the inner surfaces of its ends recessed or chambered, a supplemental spoolshaped valve located between the ends of the main valve and longitudinally movable be- IOO IIO

tween the same, the ends of said supplemental valve being formed to correspond to the recessed or chambered surfaces of the main valve whereby the movement of the supplemental valve is cushioned, substantially as described. Y

8. Valve mechanism comprising a main valveconstructed of separable sections and having a contracted portion intermediate its ends, and a supplemental valve ofa length less than the space between the ends of the main valve slidable upon said contracted portion of the main valve, 'substantially as and for the purpose described.

9. A piston-valve of the character described having a divided contracted portion intermediate its ends, and means for securing the sections of the contractedV portion together, in-

combination with a supplemental valve slidable along said contracted portion, substantially as described. y

10. A piston-valve of the character described having a divided contracted portion intermediate its ends, the sections of said contracted portion being screw-threaded together, in combination with a supplemental valve slidable along said'contracted portion, suband slidable longitudinally thereof over the contracted portion of the same, substantially as described.

12. Valve mechanism comprising afpiston steam-valve having a divided contracted portion intermediate of its ends, means for securing the sections of said contracted portion together, and a spool-shaped supplemental valve arranged between the ends of the piston-valve and slidable longitudinally thereof over the contracted portion ofthe same, the outside lap of the piston-valve being of sufficient length to permit the supplemental valve and the space between the same and the pistonvalve to pass the inlet-ports before live steam is admitted thereto, substantially as and for the purpose described.

13. Valve mechanism comprising a piston steam-valve having a contracted portion intermediate of-its ends, and a'spool-shaped supplemental valve arranged between the ends of the piston-valve and slidable longitudinally thereof over the contracted portion of the same, the outside lap of the piston-valve being of sufficient length to permit the supplemental valve and the space between the same and the piston-valve to pass the inlet-ports before live steam is admitted thereto, substantially as and.4 for the purposedescribed.

cHARLEs SCHMID.

In presence of- A JOHN W. HILL, CHARLESI. COBB. 

